Description:A metamorphic rock formed by the action of tectonic forces on a fine-grained sedimentary rock (mudstone), so that the rock splits along cleavage planes that do not follow the sedimentary layers.
Representing:Sediment deposited during the Neoproterozoic Era, about 600 million years ago, and deformed during the building of the C
Original location:Lake Louise, Alberta
Estimated mass (tonnes):4
Donor:Courtesy of Parks Canada